/*
 * Copyright 2012 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.guvnor.common.services.workingset.client.factconstraints.helper;

import org.guvnor.common.services.workingset.client.factconstraints.ConstraintConfiguration;
import org.guvnor.common.services.workingset.client.factconstraints.config.SimpleConstraintConfigurationImpl;
import org.guvnor.common.services.workingset.client.factconstraints.config.SimpleConstraintConfigurationImpl;
import org.guvnor.common.services.workingset.client.factconstraints.ConstraintConfiguration;
import org.guvnor.common.services.workingset.client.factconstraints.config.SimpleConstraintConfigurationImpl;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class ConstraintsContainer {

    private static final Map<String, ConstraintConfiguration> constraintConfigs = new HashMap<String, ConstraintConfiguration>();

    static {
        ConstraintConfiguration config = new SimpleConstraintConfigurationImpl();
        config.setConstraintName( "NotNull" );
        constraintConfigs.put( config.getConstraintName(), config );

        config = new SimpleConstraintConfigurationImpl();
        config.setConstraintName( "IntegerConstraint" );
        constraintConfigs.put( config.getConstraintName(), config );

        config = new SimpleConstraintConfigurationImpl();
        config.setConstraintName( "RangeConstraint" );
        config.setArgumentValue( "Min.value", "0" );
        config.setArgumentValue( "Max.value", "0" );
        constraintConfigs.put( config.getConstraintName(), config );

        config = new SimpleConstraintConfigurationImpl();
        config.setConstraintName( "NotMatches" );
        config.setArgumentValue( "matches", "" );
        constraintConfigs.put( config.getConstraintName(), config );

        config = new SimpleConstraintConfigurationImpl();
        config.setConstraintName( "Matches" );
        config.setArgumentValue( "matches", "" );
        constraintConfigs.put( config.getConstraintName(), config );

        config = new SimpleConstraintConfigurationImpl();
        config.setConstraintName( "IvalidFieldConstraint" );
        constraintConfigs.put( config.getConstraintName(), config );

        config = new SimpleConstraintConfigurationImpl();
        config.setConstraintName( "MandatoryFieldConstraint" );
        constraintConfigs.put( config.getConstraintName(), config );
    }

    private Map<String, List<ConstraintConfiguration>> constraints = new HashMap<String, List<ConstraintConfiguration>>();

    public ConstraintsContainer( ConstraintConfiguration[] constraints ) {
        this( Arrays.asList( constraints ) );
    }

    public ConstraintsContainer( Collection<ConstraintConfiguration> constraints ) {
        if ( constraints != null && !constraints.isEmpty() ) {
            for ( ConstraintConfiguration c : constraints ) {
                addConstraint( c );
            }
        }
    }

    public ConstraintsContainer() {

    }

    public List<ConstraintConfiguration> removeConstraint( ConstraintConfiguration c ) {
        List<ConstraintConfiguration> list = constraints.get( c.getFactType() );
        if ( list != null ) {
            list.remove( c );
        }
        return list;
    }

    public void addConstraint( ConstraintConfiguration c ) {
        List<ConstraintConfiguration> list = constraints.get( c.getFactType() );
        if ( list == null ) {
            list = new LinkedList<ConstraintConfiguration>();
            constraints.put( c.getFactType(), list );
        }
        list.add( c );
    }

    public List<ConstraintConfiguration> getConstraints( String factType ) {
        return Collections.unmodifiableList( constraints.get( factType ) );
    }

    public List<ConstraintConfiguration> getConstraints( String factType,
                                                         String fieldName ) {

        List<ConstraintConfiguration> list = constraints.get( factType );
        if ( list == null || list.isEmpty() ) {
            return Collections.emptyList();
        }
        List<ConstraintConfiguration> res = new LinkedList<ConstraintConfiguration>();
        for ( ConstraintConfiguration c : list ) {
            if ( fieldName.equals( c.getFieldName() ) ) {
                res.add( c );
            }
        }
        return res;
    }

    public boolean hasConstraints( String FactType ) {
        return constraints.containsKey( FactType );
    }

    public static Map<String, ConstraintConfiguration> getAllConfigurations() {
        return constraintConfigs;
    }

    public static ConstraintConfiguration getEmptyConfiguration( String constraintName ) {
        return copyConfig( getAllConfigurations().get( constraintName ) );
    }

    private static ConstraintConfiguration copyConfig( ConstraintConfiguration constraintConfiguration ) {
        return new SimpleConstraintConfigurationImpl( constraintConfiguration );
    }
}
